The CAS Registry Mumber 12687-54-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,2,6,8 and 7 respectively; the second part has 2 digits, 5 and 4 respectively. Calculate Digit Verification of CAS Registry Number 12687-54: (7*1)+(6*2)+(5*6)+(4*8)+(3*7)+(2*5)+(1*4)=116 116 % 10 = 6 So 12687-54-6 is a valid CAS Registry Number.
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